Torque Converter Output Temperature and Hydraulic Tank Temperature Correction for Certain Track Type Tractors{7490} Caterpillar


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Torque Converter Output Temperature and Hydraulic Tank Temperature Correction for Certain Track Type Tractors{7490} [REHS1665]
OPERATOR STATION
PANEL GP
Torque Converter Output Temperature and Hydraulic Tank Temperature Correction for Certain Track Type Tractors{7490}
1.1. Introduction
2.1. Background Information
3.1. Troubleshooting and Test Procedure
4.2. Thermometer Probe Installation Notes
5.2. Torque Converter Output Temperature
6.3. Test Procedure
7.2. Hydraulic Tank Temperature
8.3. Test Procedure
9.2. Corrective Action
Track-Type Tractor:
D8R Series II (S/N: AKA1-685; 6YZ1-1046)

Introduction

Reference: Systems Operation, Troubleshooting, Testing and Adjusting, RENR2014, "AVSpare Monitoring System". This module is part of Service Manual RENR3670.

Reference: Special Instruction, SEHS8382, "Use of the 6V-9130 Temperature Adapter Group".

The AVSpare Monitoring System on certain Track-Type Tractors (TTT) may be incorrectly reporting the Torque Converter Output Temperature and the Hydraulic Tank Temperature that is provided by the 4W-9972 Temperature Sender . When the Torque Converter Output Temperature is incorrectly reported, the following Fault Code may be displayed on the AVSpare Monitoring System:

  • MID 30, CID 177, FMI 04 (Temperature sender (Transmission Oil) voltage below normal)

  • MID 30, CID 177, FMI 08 (Temperature sender (Transmission Oil) voltage abnormal signal)

When the Hydraulic Tank Temperature is incorrectly reported, the following Fault Code may be displayed on the AVSpare Monitoring System:

  • CID 600, FMI 04 (Temperature Sender (Hydraulic Oil) voltage below normal)

  • CID 600, FMI 08 (Temperature Sender (Hydraulic Oil) abnormal signal test)

The following procedure will determine if the machine is experiencing this problem and if modifications are necessary.

Background Information

The 4W-9972 Temperature Sender is a single wire sender that has a sender case ground. As series resistance on the signal wire decreases, the temperature reading on the AVSpare Monitoring System will increase. If parallel resistance is added to the body (ground) of the sender, temperature readings on the AVSpare Monitoring System will also increase. The AVSpare Monitoring System drives the Torque Converter Output Gauge and the Hydraulic Tank Temperature Gauge on the Quad Gauge.

When machines are operating with Torque Converter Output Temperature at 117 °C (242.6 °F) to 119 °C (246.2 °F), the AVSpare Monitoring System may incorrectly determine that the machine temperature is 129 °C (264.2 °F). When this occurs, the AVSpare Monitoring System will display one of the following error codes:

  • MID 30, CID 117, FMI 04 - Torque Converter Temperature Error

  • MID 30, CID 117, FMI 08 - Temperature Sender (transmission oil) Voltage Below Normal (or abnormal reading)

When machines are operating with the Hydraulic Tank Temperature at 100 °C (212.0 °F) to 102 °C (215.6 °F), the AVSpare Monitoring System may incorrectly determine that the machine temperature is 110 °C (230.0 °F). When this occurs, the AVSpare Monitoring System will display one of the following error codes:

  • CID 600, FMI 04 (Temperature Sender (Hydraulic Oil) voltage below normal)

  • CID 600, FMI 08 (Temperature Sender (Hydraulic Oil) abnormal signal test)

When these error codes are displayed, nuisance alarms and unnecessary down time will occur.

Not all machines will experience these nuisance alarms. Only machines that are operating in extreme conditions with high ambient temperatures will be affected.

Troubleshooting and Test Procedure

When troubleshooting a Torque Converter Temperature Issue (MID 30, CID 177, FMI 04 or FMI 08) or a Hydraulic Tank Temperature Issue (CID 600, FMI 04 or CID 600, FMI 08), refer to Systems Operation, Troubleshooting, Testing and Adjusting, RENR2014, "AVSpare Monitoring System".

Prior to performing any tests, it is important to determine if the Torque Converter Oil is truly overheating or if the AVSpare Monitoring System is giving a false indication. Refer to the machine's service manual for troubleshooting procedures. Listed below are issues that might cause high temperature in Torque Converter Oil or the Hydraulic Tank.

  • Cooler blockage (cooler should be free from debris, dirt, or any other materials)

  • Machine brakes - dragging (verify that machine brakes are not dragging)

  • Torque converter - inlet and outlet pressure (verify that torque converter inlet and outlet pressure is set correctly)

  • 4W-9972 Temperature Sender (Torque Converter Oil) (ensure that the signal wire at the terminal is not damaged and is free of corrosion)

  • 4W-9972 Temperature Sender (Torque Converter Oil) - body (ensure that the sender body is free of corrosion and that a good ground path exists between the sender body and the torque converter housing)

  • 4W-9972 Temperature Sender (Torque Converter Oil) - sender signal wire (at the wiring harness, use a multimeter to check for damage to the temperature sender's signal wire)

After the above-listed steps have been completed and any problems corrected, verify the actual Torque Converter Output temperature or the Hydraulic Tank temperature (whichever is causing the issue). Compare the actual Torque Converter Output temperature or the actual Hydraulic Tank temperature to the Torque Converter Output temperature or the Hydraulic Tank temperature that was displayed by the AVSpare Monitoring System.

When measuring the Torque Converter Output temperature or the Hydraulic Tank temperature, thermometer temperature probes must be used. To measure the Torque Converter Output temperature or the Hydraulic Tank temperature, use the 4C-6500 Digital Thermometer and the 6V-9130 Temperature Adapter . Refer to Special Instruction, SEHS8382, "Use of the 6V9130 Temperature Adapter Group".

Note: In this application, the use of AVSpare Infrared Thermometers is NOT a valid measuring method. Machine tests have shown up to a Δ37 °C (Δ70 °F) difference between the infrared thermometer and the digital thermometer probe. The digital thermometer probe measures the flowing oil inside the torque converter housing or the Hydraulic Tank the same as the 4W-9972 Temperature Sender .

Thermometer Probe Installation Notes

Install the thermometer probe as close as possible and in the same oil flow as the 4W-9972 Temperature Sender . The thermometer probe must also be installed at the same depth as the 4W-9972 Temperature Sender . Use the 4W-9972 Temperature Sender to gauge the depth of the thermometer probe.

Torque Converter Output Temperature

On the D8R Series II, an unused test port can be used. This test port is located to the right of (toward the driveshaft) of the 4W-9972 Temperature Sender . The 4W-9972 Temperature Sender is located on the relief valve.

Test Procedure

  1. Remove the plug from the unused test port and install the thermometer probe. For display purposes, route the probe wires to the cab.

  1. Connect the 4C-8195 Control Service Tool to the service connector. Select "Mode 2 - Gauge 2" to display "Torque Converter Output Temperature" on the AVSpare Monitoring System. When in "Mode 2 - Gauge 2", the only gauge on the Quad Gauge that will function is the Torque Converter Output Temperature Gauge.

  1. Operate the machine as the machine was operated when the alarm was enunciated.

  1. Using the digital thermometer and the AVSpare Monitoring System, monitor the Torque Converter Output Temperature. The display will flash "45" until the oil temperature is above 45 °C (113.0 °F).

  1. If the difference between the digital thermometer and the AVSpare Monitoring System is within Δ5 °C (Δ9 °F), no action is necessary. If the difference is greater than Δ5 °C (Δ9 °F), continue to ""Corrective Action" ".

Hydraulic Tank Temperature

Test Procedure

  1. On the D8R Series II, remove the Hydraulic Tank cap and insert the digital thermometer into the oil.

  1. Connect the 4C-8195 Control Service Tool to the service connector. Select "Mode 2 - Gauge 3" to display "Hydraulic Tank (Oil) Temperature" on the AVSpare Monitoring System. When in "Mode 2 - Gauge 3", the only gauge on the Quad Gauge that will function is the Hydraulic Tank Temperature Gauge.

  1. Operate the machine as the machine was operated when the alarm was enunciated.

  1. Using the digital thermometer and the AVSpare Monitoring System, monitor the Hydraulic Tank Temperature. The display will flash "45" until the oil temperature is above 45 °C (113.0 °F).

  1. If the difference between the digital thermometer and the AVSpare Monitoring System is within Δ5 °C (Δ9 °F), no action is necessary. If the difference is greater than Δ5 °C (Δ9 °F), continue to ""Corrective Action" ".

Corrective Action

Purchase the new flashable AVSpare Monitoring System for the machine (AVSpare part number 154-7443). The software on the new flashable AVSpare Monitoring System has been updated to address the Torque Converter Output Temperature issue and the Hydraulic Tank Temperature issue. In addition, future updates can simply be flashed into the new flashable AVSpare Monitoring System.

This procedure is only to be performed on the machines that are listed on this Special Instruction and machines that meet the criteria in the test procedure.

Consult AVSpare Product support if there are any questions. This procedure is to address a software mismatch within the AVSpare Monitoring System for the Torque Converter Output Temperature and Hydraulic Tank Temperature only. Not all machines require this procedure. Only machines operating in extreme conditions will require this procedure.

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